U.S. Army Gen. David Petraeus shakes hands with his biographer, Paula Broadwell, at an undisclosed location on July 13, 2011. Petraeus resigned from his post on Nov. 9, citing an extramarital affair with Broadwell. ISAF via Getty Images

Holly Petraeus hugs her husband, former U.S. Army general David Petraeus, after he was sworn in as director of the Central Intelligence Agency on Sept. 9, 2012, in the Roosevelt Room at the White House. Mandel Ngan, AFP/Getty Images

Holly Petraeus, assistant director for the Office of Servicemember Affairs, speaks during a news conference in December 2011 at Camp Lejeune in Jacksonville, N.C. John Althouse, The Jacskonville Daily News, via AP

U.S. Army Gen. David Petraeus salutes during a change of command ceremony on July 18, 2011, in Kabul, Afghanistan. Musadeq Sadeq, AP

U.S. Army Gen. David Petraeus testifies on Capitol Hill on June 29, 2010, in Washington. Pablo Martinez Monsivais, AP

Paula Broadwell holds a drink in the kitchen of her brother's home on Nov. 13 in Washington. Cliff Owen, AP

Paula Broadwell, author of the David Petraeus biography "All In," poses with her book on Jan. 15, 2012, in Charlotte, N.C. Petraeus abruptly resigned on Nov. 9 as director of the CIA, admitting to an extramarital affair with Broadwell. T. Ortega Gaines, The Charlotte Observer, via AP

FBI agents carry boxes and a computer from the home of Paula Broadwell on Nov. 13 in Charlotte. Chuck Burton, AP

Jill Kelley leaves her home on Nov. 12 in Tampa. Kelley is identified as the woman who received harassing e-mails from Paula Broadwell. Chris O'Meara, AP

Jill Kelley looks out of a window at her home on Nov. 12 in Tampa. Chris O'Meara, AP

FBI agent Frederick W. Humphries speaks at a news conference on July 27, 2005, in Seattle. Humphries has been identified as the agent Jill Kelley contacted to complain about harassing emails sent by Paula Broadwell. Kevin P. Casey, AP

A photograph obtained by The Seattle Times shows FBI special agent Frederick W. Humphries posing with target dummies at an unknown location on Sept. 10, 2010. Humphries sent the photograph to friend Jill Kelley and others, including a Seattle Times reporter, in an email with the subject line, "Which one is Fred?" The Seattle Times via AP

Gen. David Petraeus, left, and U.S. Marine Gen. John Allen smile during a press conference at the White House on April 28, 2011. Chip Somodevilla, Getty Images

U.S. Marine Gen. John Allen attends a news conference on Oct. 10 after a meeting of NATO defense ministers at NATO headquarters in Brussels. Virginia Mayo, AP

Gen. John Allen listens during a news conference on March 26, 2012, at the Pentagon. Haraz N. Ghanbari, AP

U.S. Marine Gen. John Allen, left, and U.S. Army Gen. David Petraeus, top U.S. commander in Afghanistan and incoming CIA director, greet Defense Secretary Leon Panetta on July 9, 2011, in Kabul, Afghanistan. Pool photo by Paul J. Richards